Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/14766—Fe-Si based alloys
  • H01F1/14775—Fe-Si based alloys in the form of sheets
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
  • C21C7/0006—Adding metallic additives
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
  • C21C7/04—Removing impurities by adding a treating agent
  • C21C7/06—Deoxidising, e.g. killing
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
  • C21C7/04—Removing impurities by adding a treating agent
  • C21C7/068—Decarburising
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
  • C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
  • C21C7/10—Handling in a vacuum
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
  • C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
• • C—CHEMISTRY; METALLURGY
  • C21—METALLURGY OF IRON
  • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
  • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
  • C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/001—Ferrous alloys, e.g. steel alloys containing N
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/004—Very low carbon steels, i.e. having a carbon content of less than 0,01%
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
• • C—CHEMISTRY; METALLURGY
  • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
  • C22C—ALLOYS
  • C22C38/00—Ferrous alloys, e.g. steel alloys
  • C22C38/06—Ferrous alloys, e.g. steel alloys containing aluminium
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/14766—Fe-Si based alloys
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/16—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys in the form of sheets
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
  • H01F1/00—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties
  • H01F1/01—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials
  • H01F1/03—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity
  • H01F1/12—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials
  • H01F1/14—Magnets or magnetic bodies characterised by the magnetic materials therefor; Selection of materials for their magnetic properties of inorganic materials characterised by their coercivity of soft-magnetic materials metals or alloys
  • H01F1/147—Alloys characterised by their composition
  • H01F1/14766—Fe-Si based alloys
  • H01F1/14791—Fe-Si-Al based alloys, e.g. Sendust

Definitions

• the present invention relates to a non-oriented electrical steel sheet and a method for producing the same, and particularly to a non-oriented electrical steel sheet excellent in magnetic properties and a calcium treatment method therefor. Background technique
• the method of adding molten steel to calcium to denature oxides and sulfides to improve the quality of steel has been widely accepted by metallurgical workers.
• this technology is widely used in high-end products such as pipeline steel, gear steel, weathering steel, free cutting steel, stainless steel, electrical steel, etc. to improve the corrosion resistance, microstructure, mechanical properties, manufacturability, Electromagnetic performance, etc.
• Calcium is insoluble in molten steel and has a low melting point (850 ° C) and a low boiling point (1483 ° C). It is easy to form calcium vapor and exists as a bubble inside the molten steel. Calcium has strong deoxidation and desulfurization ability. It can react with oxygen and sulfur in molten steel to form inclusions such as complex sulfide and calcium aluminate. On the one hand, 'the calcium oxide-rich particles formed during deoxidation are easier to separate from the molten pool.
• the alumina solid additive in the molten steel can be denatured, which is convenient for reducing the melting point of the inclusions, and promoting polymerization, growth and floating, which is beneficial to improve the purity of the steel.
• calcium treatment is carried out under atmospheric conditions to avoid excessive calcium loss.
• the main methods of calcium treatment are:
• Japanese patent ⁇ Kaiping 8-157932 under atmospheric pressure, after the molten steel is deoxidized, the calcium-containing material is added by the input method.
• the patent states that the amount of calcium-containing material added depends on the silica content of the slag. Appropriate calcium treatment can improve the steel defects caused by the high number of inclusions in the finished strip;
• a CaSi wire is added to the molten steel by a feeding method.
• the yield of calcium can reach up to 6.7%, but at the end of the feeding line, the molten steel is vigorously turbulent and the secondary pollution is large.
• Japanese Patent Laid-Open No. 8-157935 has been technically improved. Prior to the wire feeding operation, the pre-opened ladle cover is placed on the ladle to avoid sufficient contact between the molten steel and the atmosphere.
• Japanese Patent Laid-Open No. 11-92819 which uses a spray method in a vacuum state to add a metal calcium, a calcium alloy, and a calcium oxide-alumina alkaline solvent mixture to a molten steel to produce a variety of calcium-based composite inclusions.
• the above materials need to be compounded to achieve better control effect of inclusions.
• the actual treatment of molten steel depends on their mixing in the molten steel, the degree of reaction, and the state of the molten steel.
• This method still has the following disadvantages: It is necessary to add metal calcium, a calcium alloy, and a calcium oxide-alumina alkaline solvent mixture to the molten steel, and this mixture has problems such as high production cost and complicated production process.
• Japanese Patent Lai-Ping 10-245621 adopts the feeding method under vacuum, and the calcium-containing material is uniformly fed into the molten steel by the circulation of molten steel, thereby ensuring better control effect of inclusions.
• the shortcoming of this method is that, due to the calcium treatment by the feeding method, the environmental pollution is large, which affects the circulation of the vacuum steel liquid, so that the actual treatment effect of the molten steel is difficult to be ensured, and the circulation method is difficult to control, thus affecting the normal RH refining.
• the processing cycle at the same time, requires higher requirements for the feeding equipment.
• An object of the present invention is to provide a non-oriented electrical steel sheet excellent in magnetic properties and a calcium treatment method therefor.
• the method of the invention can solve the problems of high production cost, complicated production process, affecting the normal processing cycle of RH refining, high requirements on equipment conditions, and uncontrollable morphology and quantity of inclusions.
• the calcium treatment method of the non-oriented electrical steel sheet of the invention reduces production cost, simple production process, does not affect the normal processing cycle of RH refining, convenient and controllable equipment, and can control the shape and quantity of inclusions.
• the non-oriented electrical steel prepared by the method of the present invention is excellent in magnetic properties.
• the present invention provides a calcium treatment method for non-oriented electrical steel, comprising an RH (Ruhrstahl-Heraeus) scouring step, which in turn comprises a decarburization step, an aluminum deoxidation step, a calcium alloy addition step, wherein the calcium addition step In the alloying step, the time for adding the calcium alloy satisfies the following conditions:
• the Al, Ca time interval refers to the interval between the time of adding aluminum in the aluminum deoxidation step and the time of adding the calcium alloy in the step of adding the calcium alloy
• the total time after ⁇ 1 refers to The time during which the aluminum is added to the aluminum deoxidation step is until the end of the RH refining.
• the calcium alloy is added in an amount of 0.5 kg/t steel to 1.2 kg/t steel.
• the calcium alloy is added in two or more batches.
• the calcium alloy is added in three or more batches, and the amount of the calcium alloy added per batch does not exceed 40% of the total amount of the calcium alloy added.
• the calcium alloy is passivated.
• the chemical composition of the calcium alloy is: Ca: 18-27%, Mg: 2-6%, Si: 20 ⁇ 35%, Al: 1-9%, Zv. 1 -5%, the balance is Fe and the inevitable inclusions.
• the sulfur content in the molten steel is controlled to be ⁇ 0.003%, preferably by desulfurization by molten iron or molten steel, and the sulfur content in the molten steel is controlled to be ⁇ 0.003%.
• a silicon deoxygenation step is employed prior to the aluminum deoxygenation step.
• a non-oriented electrical steel prepared according to the method of the present invention the chemical composition of the non-oriented electrical steel is: C ⁇ 0.005%, Si: 0 ⁇ 2 ⁇ 3.4%, ⁇ : 0.2-1.0%. ⁇ 0.2%, S ⁇ 0.003%, Al: 0.2-1.2%, ⁇ ⁇ 0.005%, ⁇ ⁇ 0.005%, the balance is Fe and unavoidable inclusions, and the non-oriented electrical steel further contains Ca ⁇ 0.0005%.
• the method of the invention solves the problems of high production cost, complicated production process, affecting the normal processing cycle of RH refining, high requirements on equipment conditions, and uncontrollable morphology and quantity of inclusions.
• the calcium treatment method of the non-oriented electrical steel sheet of the invention reduces the production cost, the production process is simple, does not affect the normal treatment cycle of the RH refining, the equipment is convenient and controllable, and the morphology and quantity of the inclusions can be controlled.
• the non-oriented electrical steel prepared by the method of the present invention is excellent in magnetic properties.
• Fig. 1 is a control effect diagram of a finished steel inclusion in a conventional heat (without adding a calcium alloy) and a calcium treating furnace (adding a calcium alloy) of the present invention.
• Figure 2 shows the effect of the amount of calcium alloy added on the steel loss and magnetic induction of the finished steel.
• Figure 3 is the effect of the sulfur content of the molten steel on the finished steel loss in the conventional heat and the calcium treatment furnace of the present invention.
• Figure 4 is a graph showing the effect of different calcium alloy addition modes on the calcium content of the feed line, the calcium treatment furnace of the present invention and the ordinary heat.
• Non-oriented electrical steel steelmaking processes include converter blowing, RH refining and continuous casting processes.
• the RH scouring step of the present invention comprises, in order, a decarburization step, an aluminum deoxidation step, and a calcium alloy addition step.
• the heat of the present invention is a calcium alloy added in a specific time period of RH scouring, and the finished steel thus prepared has a large inclusion and a small amount, so that the steel has high purity and the finished steel has excellent properties. Electromagnetic performance. Ordinary heat (without adding calcium alloy) The finished steel prepared by the product has small inclusions and large quantities, and the steel purity is not high, and the electromagnetic properties of the finished steel cannot be guaranteed.
• the Al, Ca time interval refers to the interval between the time of adding aluminum in the aluminum deoxidation step and the time of adding the calcium alloy in the step of adding the calcium alloy
• the total time after ⁇ 1 refers to The time during which the aluminum is added to the aluminum deoxidation step is until the end of the RH refining.
• the calcium treatment method of the present invention ensures that the morphology and quantity of the inclusions are controlled by adding a calcium alloy during a specific period of RH scouring, and in the method, the production cost of the calcium alloy is low, the production process is simple, and the calcium alloy is added.
• the method does not affect the normal processing cycle of RH refining, and the equipment is convenient and controllable.
• the effective calcium concentration in the molten steel is an important factor in ensuring that the inclusions are sufficiently denatured.
• the present invention further demands the amount of calcium alloy added.
• Figure 2. shows the effect of the amount of calcium alloy added on the steel loss and magnetic induction of the finished steel.
• Iron loss refers to the material's electrical energy consumption at a certain operating frequency of a silicon steel material at a specific magnetic field strength and current intensity.
• Magnetic induction refers to the magnetic flux density, which is the basic physical quantity describing the strength and direction of the magnetic field. It is usually represented by the symbol B.
• the strength of the magnetic field is expressed by the magnetic induction intensity (also called the magnetic induction intensity), and the magnetic induction intensity indicates that the magnetic induction is strong; the magnetic induction intensity is small, indicating that the magnetic induction is weak.
• the unit of magnetic induction is Tesla, referred to as T.
• T The unit of magnetic induction
• the amount of calcium alloy added is 0.5 kg / ⁇ 1.2 kg / t steel.
• the calcium alloy is added in two or more batches.
• the calcium alloy is added in three or more batches, and the amount of the calcium alloy added per batch does not exceed 40% of the total amount of the calcium alloy added.
• Passivation treatment refers to the proper increase of the surface oxide layer of the calcium alloy to reduce the reaction rate.
• the chemical composition of calcium alloys is limited. Different from the past, the test calcium alloy greatly reduces the aluminum content, appropriately increases the silicon content to increase the melting point of the calcium alloy; adjusts the calcium content to control the degree of violent reaction between calcium and molten steel; appropriately adds elements such as Mg and Zr It can increase the solubility of calcium in molten steel and increase its yield.
• the chemical composition of the calcium alloy in the present invention is: Ca: 18-27%, Mg: 2 ⁇ 6%, Si: 20-35%, Al: 1-9%, Zr: 1-5%, balance For Fe and the inevitable inclusions.
• the inventors have found through experiments that if aluminum is directly deoxidized, small-sized inclusions are formed. Even after the subsequent addition of the silicon alloy, the viscosity of the molten steel increases, the alumina inclusions are less likely to float and be removed, and at the same time, the calcium treatment has a poorer denaturation effect on the silicon oxide. If deoxidation of silicon is used before deoxidation of aluminum, that is, silicon and aluminum two-step deoxidation method are used in sequence, the silicon oxide inclusions are relatively easy to float and remove, aluminum has strong deoxidation effect, and alumina inclusions formed by subsequent deoxidation can be treated by calcium. Further removal produces calcium aluminate having a lower melting point, while suppressing fine, dispersed, small particle inclusions.
• a silicon deoxidation step is employed, that is, a two-step deoxidation method of silicon and aluminum is sequentially employed.
• the inventors have also found through industrialization tests that when the calcium treatment is carried out, the molten steel contains a high sulfur content, which causes a large amount of CaS inclusions to be formed, and it is difficult to sufficiently denature the alumina inclusions, thereby causing the effect of the inclusions in the steel to be affected, Conducive to improve the electromagnetic properties of finished steel. As shown in Fig.
• the sulfur content in the molten steel is controlled to be ⁇ 0.003%, preferably by desulfurization by molten iron or molten steel, and the sulfur content in the molten steel is controlled to be ⁇ 0.003%.
• the non-oriented electrical steel prepared by the method of the present invention generally has a chemical composition of: C ⁇ 0.005%, Si: 0.2 3.4%, Mn: 0.2 ⁇ ! .0%, P ⁇ 0.2%, S ⁇ 0.003%, Ah 0 ⁇ 2 ⁇ 1 ⁇ 2%, ⁇ 0.005%, ⁇ 0.005%, balance Fe and unavoidable inclusions, the non-oriented electrical steel further Contains Ca ⁇ 0.0005%.
• the calcium content of the ordinary heat is ⁇ 0.0005%.
• the calcium content of the feed line is ⁇ 0.0005%, the calcium treatment is carried out by the feeding method, and the environmental pollution is large, which affects the circulation of the vacuum steel liquid, so that the actual treatment effect of the molten steel is difficult to be ensured, and the circulation type is difficult to control, so Affect the normal processing cycle of RH refining, and at the same time, the requirements for the feeding equipment are high.
• the heat of the present invention is obtained by adding a calcium alloy at a specific time period of RH scouring, and the obtained steel has a calcium content of > 0.0005%, and in the method, the method of adding the calcium alloy does not affect the normal processing cycle of RH refining, equipment. Convenient and controllable. .
• C 0.005% or less.
• C is an element that strongly inhibits the growth of the finished grain, which easily deteriorates the magnetic properties of the finished strip and produces severe magnetic aging. Therefore, it must be controlled below 0.005%.
• Si 0.2 to 3.4%.
• Si is an effective element for increasing the electrical resistivity of the finished strip.
• the Si content is less than 0.2%, the effect of effectively reducing the iron loss is not obtained.
• the Si content is higher than 3.4%, the magnetic flux density is remarkably lowered, the hardness is increased, and the workability is deteriorated.
• Mn 0.2% to 1.0%.
• Mn is the same as Si and A1, which can increase the electrical resistivity of steel and improve the surface state of electrical steel. Therefore, it is necessary to add 0.2% or more.
• the manufacturing cost is significantly increased, and the magnetic properties of the finished product are lowered.
• A1 is an effective element to increase the electrical resistivity of the finished strip.
• the A1 content is less than 0.2%, the effect of reducing the iron loss is not effectively obtained, and the magnetic properties of the finished product are unstable; when the A1 content is higher than 1.2%, the manufacturing cost is remarkably increased, and the magnetic inductance of the finished product is lowered.
• P 0.2% or less. Adding a certain amount of phosphorus to the steel improves the workability of the steel sheet, but when it exceeds 0.2%, the cold rolling workability of the steel sheet is deteriorated.
• S 0.003% or less. When it exceeds 0.003%, the precipitation of the S compound such as MnS is greatly increased, and the grain growth and the iron loss are strongly inhibited, which affects the denaturation effect of the calcium treatment inclusion.
• N 0.005% or less. When it exceeds 0.005%, the precipitation of the N compound such as A1N is greatly increased, and the grain growth and the iron loss are strongly inhibited.
• the hot metal and scrap steel are matched according to the proportion. After 300 tons of converter smelting, RH refining is carried out by decarburization and deoxidation in sequence, calcium alloy is added for calcium treatment, and then continuous casting and casting is carried out to finally obtain A of 170 ⁇ 250mm thick and 800 ⁇ 1450mm wide. No. continuous casting billet.
• the relevant process parameters, magnetic performance data and chemical composition of steel are listed in Table 1 and Table 2, respectively.
• Iron loss and magnetic induction were measured according to JIS-C-2550 standard.
• the magnetic induction is ⁇ 1.76 T; the iron loss is ⁇ 5.7 W/kg, indicating that the magnetic properties of the finished steel are good. Magnetic induction ⁇ 1.76 T; iron loss > 5.7 W/kg, indicating poor magnetic properties of the finished steel. Table 1
• the added amount refers to the amount of calcium alloy added in the RH refined calcium alloy addition step.
• the timing of addition refers to the time during which the calcium alloy is added in the step of adding the calcium alloy in the RH refining, that is, the total time after the Al, Ca time interval / ⁇ 1.
• the amount of the calcium alloy added is in the range of 0.5 to 1.2 kg/t steel, and the timing of the calcium alloy addition is in the range of 0.2 to 0.8, and the deoxidation mode of Si and Al is used, and the S content is ⁇ 0.003%.
• the magnetic induction of the finished steel corresponding to Example 1-3 is ⁇ 1.76 T; the iron loss is ⁇ 5.7 W/kg, indicating that the magnetic properties of the finished steel are good, and the Ca content is ⁇ 0.0005%.
• Comparative Example 1 the amount of calcium alloy added was less than 0.5 kg/t Steel; in Comparative Example 2, the amount of calcium alloy added was greater than 1.2 kg/t Steel; in Comparative Example 3, the timing of calcium alloy addition was greater than 0.8; in Comparative Example 4, calcium The alloy addition timing is less than 0.2; in Comparative Example 5, Al, Si deoxidation mode is adopted; and in the comparative examples 1, 2, 3, and 5, the S content is more than 0.003%, so the magnetic properties of the corresponding finished steel of Comparative Examples 1-5 Sense ⁇ 1.76 T or iron loss > 5.7 W / kg, indicating the poor magnetic properties of the finished steel.
• the hot metal and scrap steel are matched in proportion, and are smelted in a 300-ton converter. RH refining is followed by decarburization and deoxidation. Calcium alloy is added for calcium treatment, and then continuous casting is performed to obtain a B of 170 to 250 mm thick and 800 to 1450 mm wide. No. continuous casting billet.
• the chemical composition of steel and related process parameters and magnetic performance data are listed in Table 3 and Table 4, respectively.
• the magnetic induction is ⁇ 1.69 T; the iron loss is ⁇ 3.8 W/kg, indicating that the magnetic properties of the finished steel are good. Magnetic induction ⁇ 1.69 T; iron loss > 3.8 W/kg, indicating poor magnetic properties of the finished steel. table 3
• the added amount refers to the amount of calcium alloy added in the RH refined calcium alloy addition step.
• the timing of addition refers to the time during which the calcium alloy is added in the step of adding the calcium alloy in the RH refining, that is, the total time after the Al, Ca time interval / ⁇ 1.
• the amount of calcium alloy added is in the range of 0.5 to 1.2 kg/t steel, and the timing of calcium alloy addition is in the range of 0.2 to 0.8, both of which are deoxidized by Si and Al, and the content of S is ⁇ 0.003%.
• the magnetic induction of the finished steel corresponding to 1-3 is ⁇ 1.69 T; the iron loss is ⁇ 3.8 W/kg, indicating that the magnetic properties of the finished steel are good, and the Ca content is ⁇ 0.0005%.
• Comparative Example 6 the S content was greater than 0.003%; in Comparative Example 7, the amount of calcium alloy added was less than 0.5 kg/t Steel, and the timing of calcium alloy addition was less than 0.2, using Al, Si deoxidation, so the corresponding ratio of Comparative Examples 6-7
• the magnetic induction of the finished steel is ⁇ 1.69 T or iron loss > 3.8 W/kg, indicating that the magnetic properties of the finished steel are poor.
• Table 1-4 shows that by controlling the timing of calcium alloy addition in the range of 0.2-0.8, the amount of calcium alloy added is in the range of 0.5-1.2 kg/t steel, using Si, Al deoxidation method, limiting S content ⁇ 0.003%, It can stably improve the control effect of inclusions, and the finished steel produced has good magnetic properties and effectively increases the Ca content in the steel. '
• the method of the invention has the characteristics of reduced production cost, simple production process, no normal processing cycle of RH refining, convenient and controllable equipment, and can control the shape and quantity of inclusions, and the non-oriented electrical steel prepared by the method of the invention Excellent magnetic properties, can be used for mass production of non-oriented electrical steel with excellent magnetic properties.

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• 2012
  • 2012-03-08 CN CN201210060172.9A patent/CN103305659B/zh active Active
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  • 2012-03-27 WO PCT/CN2012/000385 patent/WO2013131213A1/zh active Application Filing
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  • 2012-03-27 RU RU2014132735/02A patent/RU2590740C2/ru active
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